tests: Add Response Tests (#120)

* Add tests

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tests/Response/ChoiceResponseTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Tests\Response;
+
+use PhpLlm\LlmChain\Exception\InvalidArgumentException;
+use PhpLlm\LlmChain\Response\Choice;
+use PhpLlm\LlmChain\Response\ChoiceResponse;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(ChoiceResponse::class)]
+#[UsesClass(Choice::class)]
+#[Small]
+final class ChoiceResponseTest extends TestCase
+{
+    #[Test]
+    public function choiceResponseCreation(): void
+    {
+        $choice1 = new Choice('choice1');
+        $choice2 = new Choice(null);
+        $choice3 = new Choice('choice3');
+        $response = new ChoiceResponse($choice1, $choice2, $choice3);
+
+        self::assertCount(3, $response->getContent());
+        self::assertSame('choice1', $response->getContent()[0]->getContent());
+        self::assertNull($response->getContent()[1]->getContent());
+        self::assertSame('choice3', $response->getContent()[2]->getContent());
+    }
+
+    #[Test]
+    public function choiceResponseWithNoChoices(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Response must have at least one choice.');
+
+        new ChoiceResponse();
+    }
+}

tests/Response/StreamResponseTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Tests\Response;
+
+use PhpLlm\LlmChain\Response\StreamResponse;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(StreamResponse::class)]
+#[Small]
+final class StreamResponseTest extends TestCase
+{
+    #[Test]
+    public function getContent(): void
+    {
+        $generator = (function () {
+            yield 'data1';
+            yield 'data2';
+        })();
+
+        $response = new StreamResponse($generator);
+        self::assertInstanceOf(\Generator::class, $response->getContent());
+
+        $content = iterator_to_array($response->getContent());
+
+        self::assertCount(2, $content);
+        self::assertSame('data1', $content[0]);
+        self::assertSame('data2', $content[1]);
+    }
+}

tests/Response/StructuredResponseTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Tests\Response;
+
+use PhpLlm\LlmChain\Response\StructuredResponse;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(StructuredResponse::class)]
+#[Small]
+final class StructuredResponseTest extends TestCase
+{
+    #[Test]
+    public function getContentWithArray(): void
+    {
+        $response = new StructuredResponse($expected = ['foo' => 'bar', 'baz' => ['qux']]);
+        self::assertSame($expected, $response->getContent());
+    }
+
+    #[Test]
+    public function getContentWithObject(): void
+    {
+        $response = new StructuredResponse($expected = (object) ['foo' => 'bar', 'baz' => ['qux']]);
+        self::assertSame($expected, $response->getContent());
+    }
+}

tests/Response/TextResponseTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Tests\Response;
+
+use PhpLlm\LlmChain\Response\TextResponse;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(TextResponse::class)]
+#[Small]
+final class TextResponseTest extends TestCase
+{
+    #[Test]
+    public function getContent(): void
+    {
+        $response = new TextResponse($expected = 'foo');
+        self::assertSame($expected, $response->getContent());
+    }
+}

tests/Response/TollCallResponseTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Tests\Response;
+
+use PhpLlm\LlmChain\Exception\InvalidArgumentException;
+use PhpLlm\LlmChain\Response\ToolCall;
+use PhpLlm\LlmChain\Response\ToolCallResponse;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Small;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\Attributes\UsesClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(ToolCallResponse::class)]
+#[UsesClass(ToolCall::class)]
+#[Small]
+final class TollCallResponseTest extends TestCase
+{
+    #[Test]
+    public function throwsIfNoToolCall(): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage('Response must have at least one tool call.');
+
+        new ToolCallResponse();
+    }
+
+    #[Test]
+    public function getContent(): void
+    {
+        $response = new ToolCallResponse($toolCall = new ToolCall('ID', 'name', ['foo' => 'bar']));
+        self::assertSame([$toolCall], $response->getContent());
+    }
+}